Bursting piece, explosion-proof valve, battery cell, battery pack and electric energy device

Abstract

Disclosed in the present application are a bursting piece, an explosion-proof valve, a battery cell, a battery pack and an electric energy device. The bursting piece is provided with a first score and a second score, wherein the first score is configured to be in an annular shape having a first opening; the second score is configured to be in an annular shape having a second opening, and the second score is surrounded by the first score and is spaced apart from the first score; the area of a region enclosed by means of the intersection of extension lines at two ends of the outer periphery of the first score is S1; the area of a region enclosed by means of a straight line connecting two ends of the outer periphery of the second score is S2; and S1 and S2 satisfy the relational expression: 10％S1≤S2≤90％S1.

Description

Disclosed are a rupture disc, an explosion-proof valve, a single battery, a battery pack, and an electric energy device

[0001] The present application claims priority to the Chinese patent application No. 202421522211.7 filed on June 28, 2024, and entitled "Rupture disc, explosion-proof valve, single battery, battery pack, and electric energy device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and in particular to a rupture disc, an explosion-proof valve, a single battery, a battery pack, and an electric energy device. BACKGROUND

[0003] In the prior art, the explosion-proof valve of a battery is usually welded to the cover plate of the battery. When the gas pressure in the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve can be opened to release the gas generated inside the battery, so as to prevent safety accidents such as explosion of the battery. However, when the pressure in the battery changes and the pressure is too large, if the stability of the explosion-proof valve welded to the battery is not enough, the entire explosion-proof valve can be easily blown open when pressure relief; if the stability of the explosion-proof valve welded to the battery is too strong, the explosion-proof valve can not be able to timely burst and relieve pressure, both of which can damage the safety of the battery and the entire battery system. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a rupture disc which can ensure a suitable interval of burst force values, so as to balance the connection strength and pressure relief opening capacity at the first notch, and avoid the risk of easy mis-burst tearing and failure to timely burst and relieve pressure at the first notch.

[0005] The present application further provides an explosion-proof valve.

[0006] The present application further provides a single battery.

[0007] The present application further provides a battery pack.

[0008] The present application further provides an electric energy device.

[0009] According to the rupture disc of the first aspect of the present application, the rupture disc is provided with a first score and a second score, the first score is shaped as a ring with a first opening, the second score is shaped as a ring with a second opening, the second score is arranged inside and spaced from the first score, the area of the region surrounded by the intersection of the two ends of the outer periphery of the first score is S1, the area of the region surrounded by the connection of the two ends of the outer periphery of the second score is S2, S1 and S2 satisfy the relationship: 10% S1≤S2≤90% S1.

[0010] Therefore, by limiting the area size relationship of S1 and S2, a suitable blasting force value interval can be ensured, so as to balance the connection strength and pressure relief opening ability at the first score, and avoid the risk of easy mis-blast tear and failure to blast pressure relief in time.

[0011] In some examples of the present application, S1 and S2 satisfy the relationship: 25% S1≤S2≤85% S1.

[0012] In some examples of the present application, the second score is one; or, the second score is n, n second scores are arranged at intervals, S1 and S2 satisfy the relationship: 10% S1≤nS2≤90% S1, n≥2.

[0013] In some examples of the present application, the rupture disc comprises: an explosion-proof body; a blasting body, the explosion-proof body is arranged around the blasting body, the first score and the second score are arranged on the blasting body; wherein the thickness of the explosion-proof body is h1, the thickness of the blasting body is h2, h1 and h2 satisfy: h1>h2.

[0014] In some examples of the present application, the thickness of the first score is h3, h1, h2 and h3 satisfy: h1>h2>h3; and / or the thickness of the second score is h4, h1, h2 and h3 satisfy: h1>h2>h4.

[0015] In some examples of the present application, the thickness of the first score is h3, the thickness of the second score is h4, h1, h2, h3 and h4 satisfy: h1>h2>h3>h4.

[0016] In some examples of the present application, the second opening is located on the side of the second score facing the first opening.

[0017] In some examples of the present application, the second score line comprises: a stress concentration section; a first reinforcing section and a second reinforcing section, one end of the first reinforcing section and one end of the second reinforcing section are connected to two ends of the stress concentration section respectively, and the other end of the first reinforcing section and the other end of the second reinforcing section form the second opening; wherein the area of the region surrounded by the outer periphery of the stress concentration section, the outer periphery of the first reinforcing section and the outer periphery of the second reinforcing section is S2.

[0018] In some examples of the present application, in the opposite direction of the first reinforcing section and the second reinforcing section, the maximum distance between the outer peripheries of the first score line is d1, the maximum distance between the outer peripheries of the first reinforcing section and the second reinforcing section is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0019] In some examples of the present application, the first score line comprises a pressure relief opening section arranged opposite to the first opening, and the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening.

[0020] In some examples of the present application, the minimum distance between the stress concentration section and the pressure relief opening section is d1, and d1 satisfies: 1.5 mm≥d3>0.

[0021] In some examples of the present application, one of the pressure relief opening section and the stress concentration section is configured as an arc shape and the other is configured as a straight line shape.

[0022] In some examples of the present application, the pressure relief opening section is configured as a straight line shape, and the stress concentration section is configured as an arc shape protruding towards the pressure relief opening section.

[0023] In some examples of the present application, the pressure relief opening section and the stress concentration section are arranged in parallel.

[0024] In some examples of the present application, the pressure relief opening section and the stress concentration section are configured as straight line shapes parallel to each other; or the pressure relief opening section and the stress concentration section are configured as arc shapes parallel to each other.

[0025] In some examples of the present application, the first reinforcing section and the second reinforcing section are configured as straight line shapes extending from the stress concentration section to the first opening.

[0026] In some examples of the present application, the stress concentration section is configured as a straight line shape and arranged perpendicularly to the first reinforcing section and the second reinforcing section.

[0027] In some examples of the present application, the second score further comprises: a first transition arc segment connected between the first reinforcing segment and the stress concentration segment; and a second transition arc segment connected between the second reinforcing segment and the stress concentration segment; and an area of a region surrounded by an outer periphery of the stress concentration segment, an outer periphery of the first reinforcing segment, an outer periphery of the second reinforcing segment, an outer periphery of the first transition arc segment, and an outer periphery of the second transition arc segment is S2.

[0028] In some examples of the present application, the first reinforcing segment and the second reinforcing segment are arranged in parallel.

[0029] In some examples of the present application, a distance between the first reinforcing segment and the second reinforcing segment gradually increases in a direction towards the opening.

[0030] In some examples of the present application, the first score further comprises: a first arc segment and a second arc segment arranged opposite to each other and convex in a direction away from each other; a pressure relief opening segment having two ends connected to one end of the first arc segment and one end of the second arc segment, respectively; a first opening forming segment and a second opening forming segment, an extension line of the first opening forming segment and an extension line of the second opening forming segment coincide and are parallel to the pressure relief opening segment, one end of the first opening forming segment is connected to one end of the first arc segment, one end of the second opening forming segment is connected to one end of the second arc segment, and the first opening is formed between the other end of the first opening forming segment and the other end of the second opening forming segment; and an area of a region surrounded by an outer periphery of the first arc segment, an outer periphery of the second arc segment, an outer periphery of the pressure relief opening segment, an outer periphery of the first opening forming segment, and an outer periphery of the second opening forming segment is S1.

[0031] In some examples of the present application, the pressure relief opening segment, the first opening forming segment, and the second opening forming segment are all configured in a straight line shape; or the pressure relief opening segment, the first opening forming segment, and the second opening forming segment are all configured in an arcuate shape.

[0032] In some examples of the present application, the second score has a uniform thickness.

[0033] The explosion-proof valve according to the second aspect of the present application comprises the rupture disc described above.

[0034] The single battery according to the third aspect of the present application comprises the explosion-proof valve described above.

[0035] The battery pack according to the fourth aspect of the present application comprises a plurality of the single batteries described above.

[0036] The electric energy device according to the fifth aspect of the present application comprises: a device body and the battery pack.

[0037] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0039] Fig. 1 is a structural schematic view of a rupture disc according to an embodiment of the present application;

[0040] Fig. 2 is a sectional view in the direction of A-A in Fig. 1;

[0041] Fig. 3 is an enlarged view of the region C in Fig. 2;

[0042] Fig. 4 is a force analysis diagram of the rupture disc in the direction of B-B in Fig. 1 during the initiation process;

[0043] Fig. 5 is a structural schematic view of a rupture disc according to another embodiment of the present application;

[0044] Fig. 6 is a structural schematic view of a rupture disc according to still another embodiment of the present application;

[0045] Fig. 7 is a structural schematic view of a rupture disc according to still another embodiment of the present application;

[0046] Fig. 8 is a structural schematic view of a rupture disc according to still another embodiment of the present application;

[0047] Fig. 9 is a structural schematic view of a single battery according to an embodiment of the present application;

[0048] Fig. 10 is a structural schematic view of a battery pack according to an embodiment of the present application;

[0049] Fig. 11 is a structural schematic view of an electric energy device according to an embodiment of the present application.

[0050] Reference signs: 100, rupture disc; 200, explosion-proof valve; 300, single battery; 400, battery pack; 500, electric energy device; 600, device body; 1, rupture body; 11, first score; 111, first opening; 112, pressure relief opening section; 113, first circular arc section; 114, second circular arc section; 115, first opening forming section; 116, second opening forming section; 12, second score; 121, stress concentration section; 122, first reinforcing section; 123, second reinforcing section; 124, second opening; 125, first transition circular arc section; 126, second transition circular arc; 2, explosion-proof body. DETAILED DESCRIPTION

[0051] The embodiments of the present application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0052] The rupture disc 100 according to the embodiments of the present application is described below with reference to FIGS. 1-9, which can ensure a proper interval of the burst force value by defining the size relationship between S1 and S2, taking into account the connection strength and pressure relief opening ability at the first score 11.

[0053] In combination with FIGS. 1-9, the rupture disc 100 according to the first aspect of the embodiments of the present application is provided with a first score 11 and a second score 12, the first score 11 is configured in a ring shape with a first opening 111, the second score 12 is configured in a ring shape with a second opening 124, the second score 12 is surrounded by the first score 11 and is arranged in a spaced manner with the first score 11, the area of the region enclosed by the intersection of the two ends of the outer periphery of the first score 11 is S1, the area of the region enclosed by the straight line connecting the two ends of the outer periphery of the second score 12 is S2, S1 and S2 satisfy the relationship: 10% S1≤S2≤90% S1. Wherein, the ring shape can be any shape that can enclose a certain area, for example, it can also be a rectangular shape, a waist shape, a polygonal shape, etc., and is not limited thereto.

[0054] Specifically, the first score 11 is formed on the rupture disc 100 in the circumferential direction, and the first score 11 is not connected at the beginning and the end, which, compared to a complete circle of runway-type score (without a score-free part connected to the base material), can avoid the risk of the rupture disc 100 flying out during the initiation and pressure relief process, thereby improving safety. Similarly, the beginning and the end of the second score 12 are also not connected to each other, and the second score 12 is arranged in a spaced manner with the first score 11 surrounding the outer periphery thereof, which can ensure that the second score 12 and the first score 11 or the second score 12 itself form a closed contour, thereby avoiding the risk that part of the rupture disc 100 directly flies out during the initiation and pressure relief process.

[0055] It can be understood that the area of the region enclosed by the intersection of the two ends (i.e., the fracture at the two ends of the first score 11) of the outer periphery of the first score 11 is S1, the area of the region enclosed by the straight line directly connecting the two ends of the outer periphery of the second score 12 (i.e., the fracture at the two ends of the second score 12) is S2, and S1 and S2 satisfy the size relationship of 10% S1≤S2≤90% S1, which can make S2 and S1 form a correlation and remain within a reasonable interval range, thereby avoiding the burst force of the rupture disc 100 being too large or too small during initiation, and further taking into account the connection stability and pressure relief opening ability of the rupture disc 100.

[0056] Compared with S2 < 10% S1, the area of S2 is too small, which may cause the stress on the second score line 12 to be too concentrated, so that the first score line 11 prematurely reaches the size of the blasting force required for detonation, and the first score line 11 has a misfire tear phenomenon. Compared with S2 > 90% S1, the area of S2 is too large, which may cause the stress on the second score line 12 to be too dispersed and difficult to play a stress concentration role, so that the first score line 11 cannot be detonated in time, and the risk of the battery pack not being able to be depressurized in time occurs.

[0057] For example, as shown in FIGS. 1, 5, 6, and 8, S1 is the area enclosed by the intersection of the extension line (dotted line) of the two ends of the first score line 11 and the original outer periphery of the first score line 11, and S2 is the area enclosed by the straight line (dotted line) directly connected to the two ends of the second score line 12 and the original outer periphery of the second score line 12. For another example, as shown in FIG. 7, S1 is the area enclosed by the intersection of the extension line (the dotted line extended according to the original arc extension trend) of the two ends of the first score line 11 and the original outer periphery of the first score line 11, and S2 is the area enclosed by the straight line (dotted line) directly connected to the two ends of the second score line 12 and the original outer periphery of the second score line 12.

[0058] Therefore, by limiting the area size relationship of S1 and S2, a suitable blasting force value interval can be ensured, so as to balance the connection strength and pressure relief opening ability of the first score line 11, and avoid the risk of misfire tear and failure to detonate in time of the first score line 11.

[0059] Preferably, S1 and S2 satisfy the relationship: 25% S1 ≤ S2 ≤ 85% S1. Compared with S2 < 25% S1, the area of S2 is too small, which may cause the stress on the second score line 12 to be too concentrated, so that the first score line 11 prematurely reaches the size of the blasting force required for detonation, and the first score line 11 has a misfire tear phenomenon. Compared with S2 > 85% S1, the area of S2 is too large, which may cause the stress on the second score line 12 to be too dispersed and difficult to play a stress concentration role, so that the first score line 11 cannot be detonated in time, and the risk of the battery pack not being able to be depressurized in time occurs.

[0060] According to some optional embodiments of the present application, the second opening 124 is located on the side of the second score line 12 facing the first opening 111, as shown in FIG. 1, FIG. 5-FIG. 8. The second opening 124 is in an open state facing the first opening 111, the position of the first opening 111 on the outer edge of the rupture disc 100 corresponds to a fulcrum, and the position of the partial first score line 11 opposite the first opening 111 corresponds to the farthest point from the fulcrum. According to the lever principle, the farthest point is the weak point, and the setting of the second opening 124 further weakens the strength of this point, making it easier for the rupture disc 100 to burst from the position of the partial first score line 11 opposite the first opening 111.

[0061] Specifically, as shown in FIG. 1, FIG. 5-FIG. 8, the second score line 12 includes a stress concentration section 121, a first reinforcing section 122, and a second reinforcing section 123. One end of the first reinforcing section 122 and one end of the second reinforcing section 123 are connected to both ends of the stress concentration section 121, respectively, and the other end of the first reinforcing section 122 and the other end of the second reinforcing section 123 form the second opening 124. The area of the region surrounded by the outer periphery of the stress concentration section 121, the outer periphery of the first reinforcing section 122, and the outer periphery of the second reinforcing section 123 is S2. For example, the area of the region surrounded by the outer peripheries of the first reinforcing section 122, the stress concentration section 121, and the second reinforcing section 123, which are connected in sequence and connected to the outer peripheries of the ends of the first reinforcing section 122 and the second reinforcing section 123, is S2.

[0062] It can be understood that during the bursting of the rupture disc 100, stress deformation is mainly concentrated in the stress concentration section 121, so it plays a stress concentration role, and the first reinforcing section 122 and the second reinforcing section 123 play a reinforcing role. When the rupture disc 100 is opened, stress is mainly concentrated near the stress concentration section 121 due to the structure of the first reinforcing section 122, the stress concentration section 121, and the second reinforcing section 123, which form a second score line 12 similar to a "N" shape. This causes the stress concentration section 121 to deform first, and when the deformation of the stress concentration section 121 reaches a certain height, a tear occurs at the partial first score line 11 adjacent to the stress concentration section 121, and the crack spreads in both directions along the runway direction of the edge, eventually completely opening the rupture disc 100.

[0063] The reinforcing effect of the first reinforcing section 122 and the second reinforcing section 123 ensures that the stress concentration section 121 and the material between the substrate are not easily deformed due to stress, effectively reducing the deformation height of the rear part of the blasting disc 100 in the "U"-shaped second score 12, so that the local first score 11 that is first subjected to the tearing force does not need a high deformation amount to tear. Moreover, the "U"-shaped second score 12 causes the stress of the blasting disc 100 to be concentrated in the middle and rear part of the "U"-shape, while the blasting disc 100 without the "U"-shaped second score 12 in the middle has stress concentrated in the middle part of the blasting disc 100 and the stress is relatively dispersed, and the angle θ tends to 0, which leads to the blasting process, the tearing force F approaches 0, which will require a higher initiation pressure to make the first score 11 break.

[0064] Further, as shown in FIGS. 1, 5-8, the first score 11 includes a pressure relief opening section 112 arranged opposite the first opening 111, and the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is smaller than the minimum distance between the stress concentration section 121 and the first opening 111.

[0065] It can be understood that the pressure relief opening section 112 is arranged at a position on the first score 11 corresponding to the first opening 111, that is, the structural strength of the pressure relief opening section 112 is weaker than that of the first opening 111, at this time, the position of the first opening 111 corresponds to a fulcrum, and the position of the pressure relief opening section 112 opposite the first opening 111 corresponds to the farthest point from the fulcrum, and by the lever principle, the farthest point is the weak point, so that the blasting disc 100 is more easily blasted from the pressure relief opening section 112.

[0066] The stress concentration section 121 on the second score 12 can change the stress concentration position of the blasting disc 100, that is, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is smaller than the minimum distance between the stress concentration section 121 and the first opening 111, so that the part of the blasting disc 100 between the stress concentration section 121 and the pressure relief opening section 112 can quickly arch when subjected to a small initiation pressure, thereby tearing the score on the pressure relief opening section 112 at the outer edge initiation point earlier, and then extending the tearing path from the pressure relief opening section 112 to the first scores 11 on both sides. For example, the blasting disc 100 quickly arches from the score at the stress concentration section 121 when stressed, forming an angle with the outer edge initiation point (the pressure relief opening section 112), thereby playing a role in tearing the entire first score 11.

[0067] Further, compared with the prior art adopting two semicircle notches intersecting at the middle position of the notches, the first notch 11 at the outer edge of the stress concentration section 121 in the embodiment is closer, which is more conducive to the detonation of the first notch 11 at the outer edge, avoids the problems that the disc is easily detonated in the middle and the detonation area is small, and is conducive to the rapid pressure relief of the battery pack; and compared with a single circle of “runway type” notch structure (the stress on the notch is too dispersed, which is not conducive to the rapid blasting of the disc 100), the embodiment makes the opening position of the disc 100 (that is, the pressure relief opening section 112) more consistent, the detonation pressure is more stable, the required detonation pressure is smaller, and it is conducive to the pressure relief of the battery.

[0068] Specifically, as shown in FIG. 1, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is d1, and d1 satisfies: 1.5 mm ≥ d3 > 0. Wherein, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than 1.5 mm, so that the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 can be avoided. 112 is too large, so as to change the detonation pressure position on the first notch 11, reduce the required detonation pressure of the disc 100, and facilitate the rapid blasting of the disc 100 for pressure relief. For example, d3 is 0.5 mm, 1 mm or 1.5 mm, but not limited thereto.

[0069] Wherein, as shown in FIG. 1, FIG. 2 and FIG. 4, when the stress concentration section 121 is closer to the pressure relief opening section 112, the material deformation angle θ between the stress concentration section 121 and the pressure relief opening section 112 is larger, the relationship between the tearing force F1 and the vertical force F generated by the air pressure is Fsinθ=F1, so when the angle θ is larger, the tearing force F1 is larger, so the detonation can be realized at a lower detonation pressure F. In the embodiment, the second notch 12 similar to the “⊙” type makes the disc 100 concentrate stress in the rear part of the “⊙” type, and the disc 100 without the “⊙” type second notch 12 in the middle concentrates stress in the middle part of the disc 100 and the stress is more dispersed, and the angle θ tends to 0, which leads to the blasting process, the tearing force F1 approaches 0, and a higher detonation pressure is required to make the first notch 11 break.

[0070] Further, as shown in FIG. 1, FIG. 7 and FIG. 8, the pressure relief opening section 112 and the stress concentration section 121 are arranged in parallel. Wherein, the distance between the pressure relief opening section 112 and the stress concentration section 121 is equal everywhere, so as to avoid the risk that the stress is too concentrated at a certain point, which makes the disc 100 easily detonate and misfire, thereby reserving a certain safety buffer interval for the detonation air pressure of the disc 100.

[0071] Specifically, as shown in FIG. 1, FIG. 7 and FIG. 8, the pressure relief opening section 112 and the stress concentration section 121 are configured as straight lines parallel to each other; or the pressure relief opening section 112 and the stress concentration section 121 are configured as arc lines parallel to each other.

[0072] It can be understood that, as shown in FIG. 1 and FIG. 8, when the pressure relief opening section 112 and the stress concentration section 121 are both straight lines, they are parallel to each other, so that the consistency of processing is more easily ensured, and in addition, since the pressure relief opening section 112 and the stress concentration section 121 uniformly weaken the structural strength of the upper edge of the area of the bursting disc 100 sandwiched therebetween, on the one hand, this can play a role in changing the stress concentration position of the bursting disc 100, and on the other hand, it is conducive to the consistency and stability of the crack propagation on the first nick 11 at the first moment of the bursting disc 100 being initiated.

[0073] Further, as shown in FIG. 5 and FIG. 6, one of the pressure relief opening section 112 and the stress concentration section 121 is configured as an arc line, and the other of the pressure relief opening section 112 and the stress concentration section 121 is configured as a straight line. For example, the stress concentration section 121 is configured as a straight line, and the pressure relief opening section 112 is configured as an arc line, so that the stress concentration area can be made smaller, so that the stress can be more quickly concentrated on the bursting disc 100 therebetween, and the bursting disc 100 can be made to have a faster initiation speed, thereby improving the initiation sensitivity of the bursting disc 100.

[0074] Specifically, as shown in FIG. 5 and FIG. 6, the pressure relief opening section 112 is configured as a straight line, and the stress concentration section 121 is configured as an arc line that protrudes toward the pressure relief opening section 112. It can be understood that, when the pressure relief opening section 112 is configured as a straight line and the stress concentration section 121 is configured as an arc line, the stress concentration area can be made smaller, so that the required initiation stress of the bursting disc 100 is smaller, and the pressure relief speed of initiation is faster.

[0075] Further, as shown in FIG. 1, FIG. 5-FIG. 8, the first reinforcing section 122 and the second reinforcing section 123 are configured as straight lines extending from the stress concentration section 121 in the direction of the first opening 111. It can be understood that, when the first reinforcing section 122 and the second reinforcing section 123 are configured as straight lines, the spatial mode between the stress concentration section 121 and the first opening 111 can be increased, so that on the one hand, the required initiation force of the bursting disc 100 between the stress concentration section 121 and the pressure relief opening section 112 when being initiated is reduced, and on the other hand, the pressure can be more concentrated in the area between the stress concentration section 121 and the pressure relief opening section 112, thereby being conducive to improving the rapid initiation of the bursting disc 100.

[0076] Specifically, as shown in FIG. 1 and FIG. 8, the stress concentration section 121 is configured in a straight line shape, and the stress concentration section 121 is arranged perpendicularly to the first reinforcing section 122 and the second reinforcing section 123. The stress concentration section 121 is configured in a straight line shape, which can ensure the accuracy and consistency of the processing.

[0077] In addition, the stress concentration section 121 is connected to the first reinforcing section 122 and the second reinforcing section 123 in a perpendicular manner, respectively. When the rupture disc 100 is subjected to the gas pressure, the stress is concentrated at the stress concentration section 121, and the first reinforcing section 122 and the second reinforcing section 123 reinforce the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, so that the rupture disc 100 is not easily deformed in the direction perpendicular to the stress concentration section 121, effectively reducing the deformation height of the rupture disc 100 near the stress concentration section 121, and the relief opening section 112 can be torn without a very high deformation amount.

[0078] Further, as shown in FIG. 1, the second score 12 further comprises a first transition arc section 125 and a second transition arc section 126, the first transition arc section 125 is connected between the first reinforcing section 122 and the stress concentration section 121, and the second transition arc section 126 is connected between the second reinforcing section 123 and the stress concentration section 121; the area of the region surrounded by the outer periphery of the stress concentration section 121, the outer periphery of the first reinforcing section 122, the outer periphery of the second reinforcing section 123, the outer periphery of the first transition arc section 125 and the outer periphery of the second transition arc section 126 is S2.

[0079] For example, the area of the region surrounded by the outer peripheries of the first reinforcing section 122, the first transition arc section 125, the stress concentration section 121, the second transition arc section 126 and the second reinforcing section 123 in sequence and the straight line connecting the outer peripheries of the first reinforcing section 122 and the second reinforcing section 123 is S2.

[0080] It can be understood that the first transition arc section 125 serves to uniformly transition and connect the first reinforcing section 122 and the stress concentration section 121, avoiding the formation of a stress concentration region at the connection between the first reinforcing section 122 and the stress concentration section 121, and the second transition arc section 126 serves to uniformly transition and connect the second reinforcing section 123 and the stress concentration section 121, avoiding the formation of a stress concentration region at the connection between the second reinforcing section 123 and the stress concentration section 121, thereby ensuring the processing continuity of the one-piece forming of the second score 12 on the one hand, and ensuring the effect that the first reinforcing section 122 and the second reinforcing section 123 do not interfere with each other.

[0081] Specifically, as shown in FIG. 1, FIG. 5, FIG. 7 and FIG. 8, the first reinforcing section 122 and the second reinforcing section 123 are arranged in parallel. It can be understood that the distance between the first reinforcing section 122 and the second reinforcing section 123 is equal everywhere, so as to facilitate the consistency and accuracy of processing.

[0082] Further, as shown in FIG. 6, the distance between the first reinforcing section 122 and the second reinforcing section 123 gradually increases in the direction towards the first opening 111. It can be understood that the first reinforcing section 122 and the second reinforcing section 123 are respectively connected to one end of the stress concentration section 121, and the distance between the first reinforcing section 122 and the second reinforcing section 123 shows an increasing trend in the direction towards the first opening 111, so as to decompose the extension path in the direction parallel to the stress concentration section 121 and the direction perpendicular to the stress concentration section 121, thereby further enhancing the stress concentration effect of the stress concentration section 121, and increasing the area of the reinforcing section for strengthening the structure of the rupture disc 100 between the stress concentration section 121 and the first opening 111, thereby improving the initiation reliability of the rupture disc 100.

[0083] Specifically, as shown in FIG. 1, in the opposite direction of the first reinforcing section 122 and the second reinforcing section 123, the maximum distance between the outer periphery of the first score 11 is d1, and the maximum distance between the outer periphery of the first reinforcing section 122 and the outer periphery of the second reinforcing section 123 is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0084] It can be understood that in the opposite direction of the first reinforcing section 122 and the second reinforcing section 123 (such as the left-right direction in the figure), the maximum distance d1 between the outer periphery of the first score 11 and the maximum distance d2 between the outer periphery of the first reinforcing section 122 and the outer periphery of the second reinforcing section 123 satisfy the size relationship of 25% d1≤d2≤85% d1, so as to form a correlation between d1 and d2 and keep them within a reasonable interval range, thereby avoiding the blasting force of the rupture disc 100 being too large or too small when initiating, and further taking into account the connection stability and pressure relief opening ability of the rupture disc 100.

[0085] Among them, compared with d2<25% d1, at this time the maximum distance d2 is too small, so it may cause the stress on the second score 12 to be too concentrated, thereby causing the first score 11 to reach the size of the blasting force required for initiation too early, and the first score 11 occurs misfire tearing phenomenon; compared with d2>85% d1, at this time the maximum distance d2 is too large, so it may cause the stress on the second score 12 to be too dispersed and difficult to play a stress concentration role, thereby causing the first score 11 to be unable to initiate in time, and further causing the risk of the battery pack being unable to relieve pressure in time.

[0086] For example, as shown in FIG. 1, the area formula of S1 is S1=(d1-d5)×d5+π×d52 / 4, d5 is the diameter of the first circular arc segment 113 and the second circular arc segment 114, the area formula of S1 is S2=d2×(d4-R)+πR2 / 2+(d2-2R)R, d4 is the sum of the radius of the first reinforcing segment 122 and the first transition circular arc segment 125, R is the radius of the first transition circular arc segment 125 and the second transition circular arc segment 126, R≥0.3mm. In this way, not only is the processing convenient, but also the consistency and accuracy of the required pressure for detonation can be ensured.

[0087] According to some optional embodiments of the present application, as shown in FIG. 8, the second score 12 is one; or the second score 12 is n, and the n second scores 12 are arranged at intervals, S1 and S2 satisfy the relationship: 10% S1≤nS2≤90% S1, n≥2.

[0088] Specifically, the first score 11 surrounds a plurality of second scores 12, and a plurality of similar second scores 12 combined in this way can also achieve the effect of small detonation pressure and fast detonation speed. Among them, the sum of the S2 areas formed by the plurality of second scores 12 surrounded inside the first score 11 and the S1 formed by the first score 11 satisfy the size relationship of 10% S1≤nS2≤90% S1, so that the appropriate blasting force value interval can be ensured, thereby taking into account the connection strength and pressure relief opening ability at the first score 11, and thereby avoiding the risk of easy mis-blast tearing and unable to timely blast pressure relief at the first score 11.

[0089] According to some optional embodiments of the present application, as shown in FIG. 1, the first score 11 further includes a first circular arc segment 113, a second circular arc segment 114, a pressure relief opening segment 112, a first opening forming segment 115 and a second opening forming segment 116, the first circular arc segment 113 and the second circular arc segment 114 are oppositely arranged and protrude away from each other, the two ends of the pressure relief opening segment 112 are connected with one end of the first circular arc segment 113 and one end of the second circular arc segment 114 respectively, the extension line of the first opening forming segment 115 and the extension line of the second opening forming segment 116 coincide and are parallel to the pressure relief opening segment 112, one end of the first opening forming segment 115 is connected to one end of the first circular arc segment 113, one end of the second opening forming segment 116 is connected to one end of the second circular arc segment 114, and the first opening 111 is formed between the other end of the first opening forming segment 115 and the other end of the second opening forming segment 116; wherein the area of the region surrounded by the outer periphery of the first circular arc segment 113, the outer periphery of the second circular arc segment 114, the outer periphery of the pressure relief opening segment 112, the outer periphery of the first opening forming segment 115 and the outer periphery of the second opening forming segment 116 is S1.

[0090] For example, the area of the region jointly formed by the outer periphery of the first opening forming segment 115, the second opening forming segment 116, and the extension line of the outer periphery of the first opening forming segment 115 and the second opening forming segment 116, which sequentially connect the first opening forming segment 115, the first circular arc segment 113, the pressure relief opening segment 112, the second circular arc segment 114, and the second opening forming segment 116, is S2.

[0091] In detail, the first opening forming segment 115, the first circular arc segment 113, the pressure relief opening segment 112, the second circular arc segment 114, and the second opening forming segment 116 are sequentially connected, the extension line of the first opening forming segment 115 and the extension line of the second opening forming segment 116 coincide with each other, and the first opening 111 is spaced between the other end of the first opening forming segment 115 and the other end of the second opening forming segment 116. The first circular arc segment 113 and the second circular arc segment 114 protrude away from each other, that is, the first score 11 is integrally configured as a runway type shape with the first opening 111. Such a score structure is simpler, does not affect the critical pressure of the bursting disc 100, can meet the explosion-proof strength requirement of the single battery 300, can ensure the basic pressure relief function, and can prevent the bursting disc 100 from flying out during detonation.

[0092] Specifically, as shown in FIGS. 1, 5-8, the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are all configured as straight lines; or the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are all configured as arc lines. That is, the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are configured as straight lines or arc lines, which can easily ensure the accuracy and consistency of processing. In addition, the connection between different score segments on the first score 11 adopts a circular arc transition, which can more easily ensure the processing and manufacturing of the integral molding of the first score 11.

[0093] According to some optional embodiments of the present application, as shown in FIGS. 1, 5-8, the bursting disc 100 includes an explosion-proof body 2 and a bursting body 1, the explosion-proof body 2 is arranged around the bursting body 1, the first score 11 and the second score 12 are arranged on the bursting body 1; wherein the thickness of the explosion-proof body 2 is h1, the thickness of the bursting body 1 is h2, the thickness of the first score 11 is h3, and the thickness of the second score 12 is h4, h1, h2, h3, and h4 satisfy: h1>h2>h4>h3. Wherein, the thickness of the first score 11 and the second score 12 refers to the thickness of the explosion-proof body 2 remaining after the first score 11 and the second score 12 form the score grooves.

[0094] Specifically, the thickness distribution relationship can change the stress concentration position of the rupture disc 100 under the action of the second score 12 and cannot be opened before the detonation zone (the pressure relief opening segment 112), that is, the rupture disc 100 can be accurately exploded at the pressure relief opening segment 112, preventing the phenomenon of insufficient pressure relief area caused by explosion at the position of the second score 12, ensuring the consistency and accuracy of the pressure required for the rupture disc 100 to explode. In addition, the thickness of the explosion-proof body 2 is greater than the thickness of the explosion body 1, so the strength of the base material welding area of the rupture disc 100 can also be ensured.

[0095] According to some optional embodiments of the present application, the thickness of the second score 12 is the same, which can ensure the consistency and accuracy of the second score 12, and the stress on each part of the second score 12 is more uniform, thereby ensuring the consistency of the explosion pressure of the rupture disc 100.

[0096] In combination with FIGS. 1 and 9, the explosion-proof valve 200 according to the second aspect of the present application includes the rupture disc 100 of the above-mentioned embodiments, so that the explosion-proof valve 200 with the rupture disc 100 can make the required explosion pressure of itself smaller and the pressure relief speed faster when exploding.

[0097] As shown in FIG. 9, the single battery 300 according to the third aspect of the present application includes the explosion-proof valve 200 of the above-mentioned embodiments, so that the single battery 300 with the explosion-proof valve 200 can more quickly dissipate the high pressure inside when the single battery 300 encounters an explosion caused by a collision inside, thereby improving the safety of the single battery 300.

[0098] As shown in FIG. 10, the battery pack 400 according to the fourth aspect of the present application includes a plurality of single batteries 300 of the above-mentioned embodiments, so that the battery pack 400 with the single battery 300 can timely and quickly relieve the pressure of the battery pack in a sudden high pressure state, thereby improving the safety of the battery pack 400.

[0099] As shown in FIG. 11, the electric energy device 500 according to the fifth aspect of the present application includes a device body 600 and a battery pack 400 of the above-mentioned embodiments. The electric energy device 500 can be a vehicle, an aircraft, a ship, an energy storage device, or a household appliance, etc. The vehicle and other devices with the battery pack 400 can improve the safety thereof and ensure the safety of the user.

[0100] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the application.

[0101] In the description of the application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0102] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0103] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A burst disc (100), wherein, The rupture disc (100) is provided with a first score (11) and a second score (12), the first score (11) is annular in shape with a first opening (111), the second score (12) is annular in shape with a second opening (124), the second score (12) is surrounded by the first score (11) and is spaced apart from the first score (11), the area of the region surrounded by the intersection of the two ends of the outer periphery of the first score (11) is S1, the area of the region surrounded by the connection of the two ends of the outer periphery of the second score (12) is S2, S1 and S2 satisfy the relationship: 10% S1≤S2≤90% S1.

2. The burst disc (100) of claim 1, wherein, S1 and S2 satisfy the relationship: 25% S1≤S2≤85% S1.

3. The burst disc (100) of claim 1, wherein, The second score (12) is one; Alternatively, the second score (12) is n, n second scores (12) are spaced apart, S1 and S2 satisfy the relationship: 10% S1≤nS2≤90% S1, n≥2.

4. The burst disc (100) according to any one of claims 1-3, wherein, The rupture disc (100) comprises: An explosion-proof body (2); An explosion body (1), the explosion-proof body (2) is arranged around the explosion body (1), the first score (11) and the second score (12) are arranged on the explosion body (1); Wherein, the thickness of the explosion-proof body (2) is h1, the thickness of the explosion body (1) is h2, h1 and h2 satisfy: h1>h2.

5. The burst disc (100) of claim 4, wherein, The thickness of the first score (11) is h3, h1, h2 and h3 satisfy: h1>h2>h3; and / or the thickness of the second score (12) is h4, h1, h2 and h3 satisfy: h1>h2>h4.

6. The burst disc (100) of claim 4, wherein, The thickness of the first score (11) is h3, the thickness of the second score (12) is h4, h1, h2, h3 and h4 satisfy: h1>h2>h3>h4.

7. The burst disc (100) according to any one of claims 1-6, wherein, The second opening (124) is located on the side of the second score (12) facing the first opening (111).

8. The burst disc (100) according to any one of claims 1-7, wherein, The second score (12) comprises: A stress concentration section (121); A first reinforcing section (122) and a second reinforcing section (123), one end of the first reinforcing section (122) and one end of the second reinforcing section (123) are connected to the two ends of the stress concentration section (121), respectively, the second opening (124) is formed between the other end of the first reinforcing section (122) and the other end of the second reinforcing section (123); Wherein, the area of the region surrounded by the outer periphery of the stress concentration section (121), the outer periphery of the first reinforcing section (122) and the outer periphery of the second reinforcing section (123) is S2.

9. The burst disc (100) of claim 8, wherein, In the opposite direction of the first reinforcing section (122) and the second reinforcing section (123), the maximum distance between the outer peripheries of the first score (11) is d1, the maximum distance between the outer peripheries of the first reinforcing section (122) and the second reinforcing section (123) is d2, d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

10. The burst disc (100) according to claim 8 or 9, wherein The first score line (11) comprises a pressure relief opening segment (112) oppositely arranged with the first opening (111), and a minimum distance between the stress concentration segment (121) and the pressure relief opening segment (112) is smaller than a minimum distance between the stress concentration segment (121) and the first opening (111).

11. The burst disc (100) of claim 10, wherein, The minimum distance between the stress concentration segment (121) and the pressure relief opening segment (112) is d1, and d1 satisfies: 1.5mm≥d3>0.

12. The burst disc (100) according to claim 10 or 11, wherein One of the pressure relief opening segment (112) and the stress concentration segment (121) is configured as an arc shape, and the other is configured as a straight line shape.

13. The burst disc (100) of claim 12, wherein, The pressure relief opening segment (112) is configured as a straight line shape, and the stress concentration segment (121) is configured as an arc shape protruding towards the pressure relief opening segment (112).

14. The burst disc (100) of claim 10, wherein, The pressure relief opening segment (112) and the stress concentration segment (121) are arranged in parallel.

15. The burst disc (100) of claim 14, wherein, The pressure relief opening segment (112) and the stress concentration segment (121) are configured as straight lines parallel to each other; or The pressure relief opening segment (112) and the stress concentration segment (121) are configured as arcs parallel to each other.

16. The burst disc (100) according to any one of claims 8-15, wherein, The first reinforcing segment (122) and the second reinforcing segment (123) are configured as straight lines extending from the stress concentration segment (121) to the first opening (111).

17. The burst disc (100) of claim 16, wherein, The stress concentration segment (121) is configured as a straight line and is arranged perpendicularly to the first reinforcing segment (122) and the second reinforcing segment (123).

18. The burst disc (100) of claim 16 or 17, wherein, The second score line (12) further comprises: A first transition arc segment (125) connected between the first reinforcing segment (122) and the stress concentration segment (121); A second transition arc segment (126) connected between the second reinforcing segment (123) and the stress concentration segment (121); An area surrounded by an outer periphery of the stress concentration segment (121), an outer periphery of the first reinforcing segment (122), an outer periphery of the second reinforcing segment (123), an outer periphery of the first transition arc segment (125), and an outer periphery of the second transition arc segment (126) is S2.

19. The burst disc (100) according to any one of claims 8-18, wherein, The first reinforcing segment (122) and the second reinforcing segment (123) are arranged in parallel.

20. The burst disc (100) according to any one of claims 8-18, wherein, A distance between the first reinforcing segment (122) and the second reinforcing segment (123) gradually increases in a direction towards the first opening (111).

21. The burst disc (100) according to any one of claims 1-20, wherein, The first score line (11) further comprises: A first arc segment (113) and a second arc segment (114) oppositely arranged and protruding away from each other; A pressure relief opening segment (112) having two ends respectively connected with one end of the first arc segment (113) and one end of the second arc segment (114); A first opening forming section (115) and a second opening forming section (116), an extension line of the first opening forming section (115) and an extension line of the second opening forming section (116) coincide and are parallel to the pressure relief opening section (112), one end of the first opening forming section (115) is connected to one end of the first circular arc section (113), one end of the second opening forming section (116) is connected to one end of the second circular arc section (114), the other end of the first opening forming section (115) and the other end of the second opening forming section (116) form the first opening (111); Wherein, the area of the region surrounded by the outer periphery of the first circular arc section (113), the outer periphery of the second circular arc section (114), the outer periphery of the pressure relief opening section (112), the outer periphery of the first opening forming section (115) and the outer periphery of the second opening forming section (116) is S1.

22. The burst disc (100) of claim 21, wherein, The pressure relief opening section (112), the first opening forming section (115) and the second opening forming section (116) are all configured as straight lines; or The pressure relief opening section (112), the first opening forming section (115) and the second opening forming section (116) are all configured as arc lines.

23. The burst disc (100) according to any one of claims 1-22, wherein, The thickness of the second score line (12) is the same everywhere.

24. An explosion relief valve (200), wherein The rupture disc (100) of any one of claims 1-23. The explosion-proof valve (200) of claim 24.

25. A monobloc battery (300), wherein, The battery pack (400) of claim 26. The plurality of single batteries (300) of claim 25.

26. A battery pack (400), wherein The battery pack (400) of claim 26. The device body (600) and the battery pack (400) of claim 26.

27. An electrical energy device (500), wherein ​ ​

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